package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.enumeration.OperationType;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    /**
     * 新增菜品和口味实现
     * @param dishDTO
     */
    @Override
    @Transactional //事务
    public void saveWithFlavor(DishDTO dishDTO) {
//        拷贝类数据操作
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
//        插入一条数据
        dishMapper.insert(dish);

//        因为插入口味需要知道菜品的id，所以我们先获取菜品id
        Long dishId = dish.getId();
//        遍历菜品口味的数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
//        进行判断口味是否需要添加
        if(flavors!= null && flavors.size()>0){
//            遍历flavors然后赋值setId，使用lambda表达式，dishFlavor是变量
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
        }
//        这里才可以正式插入数据
        dishFlavorMapper.insertBatch(flavors);
    }


    @Override
    public PageResult pageQueue(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQueue(dishPageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());
    }

    @Override
    @Transactional
    public void deleteBatch(List<Long> ids) {
//        判断当前菜品是否能够删除——是否存在正在售卖{起售}的商品？
        for(Long id:ids){
            Dish dish = dishMapper.getById(id);
            if(dish.getStatus() == StatusConstant.ENABLE){
//                当前菜品在起售，不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }

//        判断当前菜品是否能够删除——是否被套餐关联的商品？
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if(setmealIds!=null && setmealIds.size()>0){
//            这个菜品被关联了套餐，没办法删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

//        这个是原先的代码，我们等等进行扩展，减少sql语句，提升性能
////        删除菜品中的菜品数据
//        for(Long id:ids){
//            dishMapper.deleteById(id);
////        删除菜品关联的菜品口味数据
//            dishFlavorMapper.deleteByDishId(id);
//        }

/*
        这里我们用新方法进行扩展

 */
//        根据菜品的ID集合批量删除菜品
        dishMapper.deleteByIds(ids);
//        根据菜品的id集合批量删除所对应的菜品口味
        dishFlavorMapper.deleteByDishIds(ids);
    }

    /**
     * 根据id查询菜品和对应的口味数据
     * @param id
     * @return
     */
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        //根据id查询菜品数据
        Dish dish = dishMapper.getById(id);

        //根据菜品id查询口味数据
        List<DishFlavor> flavors =dishFlavorMapper.getById(id);
        //将查询到的数据封装到VO
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(flavors);
        return dishVO;
    }

    /**
     * 根据id修改菜品基本信息和对应的口味信息
     * @param dishDTO
     */
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        //修改菜品表基本信息
        dishMapper.update(dish);

        //删除原有的口味数据

        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        //重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors!=null && flavors.size()>0){
            flavors.forEach(dishFlavor->{
                dishFlavor.setDishId(dishDTO.getId());
            });
        //向口味表插入n条数据
        dishFlavorMapper.insertBatch(flavors);
        }
    }

    @Override
    public List<Dish> list(Long categoryId) {
        Dish dish = new Dish();
        dish.setCategoryId(categoryId);
        dish.setStatus(StatusConstant.ENABLE);
        return dishMapper.list(dish);
    }

    /**
     * 启用禁用菜品
     * @param status
     * @param id
     */
    @Override
    public void startOrStop(Integer status, Long id) {
        Dish dish = new Dish();
        dish.setId(id);
        dish.setStatus(status);
        dishMapper.update(dish);
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getById(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }
}
